VARIABLE CAPACITANCE CIRCUIT, VARIABLE CAPACITANCE DEVICE, RESONANCE CIRCUIT, AMPLIFICATION CIRCUIT AND ELECTRONIC APPARATUS

VARIABLE CAPACITANCE CIRCUIT, VARIABLE CAPACITANCE DEVICE, RESONANCE CIRCUIT, AMPLIFICATION CIRCUIT AND ELECTRONIC APPARATUS

PROBLEM TO BE SOLVED: To provide a variable capacitance circuit that effectively optimizes transmission efficiency of an antenna by setting a capacitance value by DC voltages applied to variable capacitance capacitors.SOLUTION: A variable capacitance circuit 1 includes: a series variable capacitance...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: KANNO MASAKI
Format: Patent
Sprache:eng
Schlagworte:
BASIC ELECTRIC ELEMENTS
BASIC ELECTRONIC CIRCUITRY
CAPACITORS
CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES ORLIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS
RESONATORS
TRANSMISSION
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Beschreibung
Zusammenfassung:PROBLEM TO BE SOLVED: To provide a variable capacitance circuit that effectively optimizes transmission efficiency of an antenna by setting a capacitance value by DC voltages applied to variable capacitance capacitors.SOLUTION: A variable capacitance circuit 1 includes: a series variable capacitance element 2 comprising two variable capacitance capacitors (CS1, CS2) 2a, 2b connected in series; and a parallel variable capacitance element 4 connected in series with the series variable capacitance element 2. The parallel variable capacitance element 4 comprises two variable capacitance capacitors (CP1, CP2) 4a, 4b connected in series, and a variable capacitance capacitor (CP3) 6 connected in parallel therewith. The variable capacitance circuit 1 includes three DC terminals 7a, 7b, 7c.